AS the new ARP bolt are rated for 500+ Hp they are abit longer thatn the stock bolts. So I had 2 options, follow the instruction from Mummert and rill and thread the block to allow longer bolts, but needed to handle the fact that the bolts would end up in the oil holes to the main caps. Or realise that I am only build a 200+ Hp truck and grind down the bolts so that I dont need to drill the block.
I opted for option #2. to minimize breaking a tap in the block.
To careful attention when grinding down the bolts to not overheat them and loose strength.
To careful attention when grinding down the bolts to not overheat them and loose strength.
When bolts where grinded down, instruction said that bolt should mate with top of main bearing cap without the washer to make sure it wont bottom out when torquing them down later. Unfortunately 2 hole was just a bit shorter then then rest, hence I had about 1.5 mm play between bolt head and cap. So I decided to take a tap and thread the last 1.5 mm. 1:st hole went like a charm, 2:nd hole went like a disaster. I had measure to see so that it was still space for additional thr,ead, without drilling. But somehow the thread snapped immediately down in the hole, wedging it so it was impossible to get out. Eventually it broke of.
A few days later I got help from a friend that has an EDM (Electro discharge machining). Pretty much a revered arc welder water cooled.
Turned out great, and after a while the tap was gone, thread chased and still looked good, and bearing cap firmly torqued down again.
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